feat(setup): wire setup command into CLI and start command

- Register setup command in CLI index
- Offer setup wizard when running `flynn start` with no config
- Guard telegram log output since telegram is now optional

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/cli/start.ts

@@ -11,8 +11,25 @@ export function registerStartCommand(program: Command): void {
       const configPath = opts.config ?? getConfigPath();
 
       if (!existsSync(configPath)) {
+        // Offer setup wizard
+        const { createInterface } = await import('readline/promises');
+        const { createPrompter } = await import('./setup/prompts.js');
+        const rl = createInterface({ input: process.stdin, output: process.stdout });
+        const p = createPrompter(rl);
+        const runWizard = await p.confirm(
+          'No configuration found. Would you like to run the setup wizard?',
+          true,
+        );
+        rl.close();
+
+        if (runWizard) {
+          const { runSetup } = await import('./setup.js');
+          await runSetup(configPath);
+          return;
+        }
+
         console.error(`Config file not found: ${configPath}`);
-        console.error('Run "flynn doctor" to diagnose, or create a config at ~/.config/flynn/config.yaml');
+        console.error('Run "flynn setup" to create one, or "flynn doctor" to diagnose.');
         process.exit(1);
       }